T.
J. Tsarong gives the composition only of bDud.rTsi.Ril.dKar ("the white nectar
pill"), which is used medicinally, but not of bDud.rTsi.Ril.dMar ("the
red nectar pill") which is used by yogins and for initiations. The "white nectar
pill" contains "Ash of a fossilized stone (Bya.rDo), Hedychium
spicatum, black salt, Hippophae rhamnoides, Piper longum".

I
have, as yet, been unable to find any other reference to "the sageMandavya,
who dwelt on the Vindhyas". The Vindhyas are a range of mountains in the South of
India inhabited by Dravidian people. In the Indian tradition mountains are considered to
be repositories of medicinal herbs.

Nagas
are snake-spirits. They have the power to change their shape, their females (nagini)
often assuming the guise of beautiful women. Although they inhabit the subterranean land
of "Patala", they are connected with the water element and have the power to
bring rain.

The
wealth deity Kubera (also written Kuvera, Sanskrit for "deformed") is considered
the lord of the yakshas and is thus called yaksharaja. The name Natakubera
literally means "the bent and misshapen one".

The
underworld realm of the asuras. Due to their common "anti-god"
alignment, it is also said to house the yakshas and the nagas. Patala
should not be confused with either:
(a) Potala, the "pure land" of the bodhisattva Avalokiteshvara, or
(b) the Potala Palace in Lhasa, Tibet. This palace was the seat of the Dalai Lamas from
the 16th to the 20th centuries. It was built by the "Great Fifth" Dalai Lama who
named it after the realm of Avalokiteshvara.

Originally
a class of gigantic, goblin-like, chthonic demons in Indian popular culture, sometimes
said to bring disease. In Buddhist literature, converted Yakshasare
frequently cited as protectors of Buddhism.

The word Yakshiniis the feminine form of yaksha.
I think we may confidently assume that the yakshini in question is the Hindu
goddess Kali in Buddhist guise. That she is said to be a mere yakshiniand a servant of
Kuvera (Kubera) is an example of the mutual denigration of deities which typified the
inter-religious rivalry between Hindus and Buddhists.